Patent US3770962A successfully refreshed from Google Patents.
US3770962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation detection method
Assignee: General Electric Co
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Filing: 1971-11-01
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Granted: 1973-11-06
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Expires: 1991-11-01
Abstract
Abstract A process for detecting radiation damage which comprises exposing a surface of a thin sheet of a dielectric material to radiation to form tracks of radiation damaged material therein which pass through the thickness of the sheet. The sheet is then contacted with an etchant which selectively dissolves and removes the tracks of radiation damage material to form holes extending from one surface of the sheet through the opposite surface. The resulting holes are a measure of radiation damage and are detected by visual means by detecting the light which emerges from the holes on the one side of the etched sheet while the opposite side of the etched sheet is irradiated with light having a wavelength which is absorbed by the material in an amout sufficient to produce a significant contrast to the light passing through the holes.
Inventors
- 👤 R Fleischer
- 👤 R Walker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
G; G01; G01T; G01T5/00; G01T5/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
187 words
A process for detecting and measuring radiation damage which comprises providing a sheet of a dielectric material having a thickness ranging from about 1 micron to 20 microns, said material being characterized as a colored material translucent or transparent to white light and having the property of absorbing visible light of a color except white sufficiently when irradiated with said absorbable light to substantially block transmission thereof and to appear opaque therein, exposing said sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface of said sheet, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface of said sheet, said holes not being visible to the unaided eye, irradiating said absorbable colored light on one side of said sheet making said sheet appear opaque therein, said sheet allowing transmission of said colored light only through said holes therein and said colored light emerging from said holes on the opposite side of said sheet being detectable by the unaided eye.
Claim 2
Dependent Claim
187 words
A process for detecting and measuring radiation damage which comprises providing a sheet of a dielectric material having a thickness ranging from about 1 micron to 20 microns, said material being characterized as a colored material translucent or transparent to white light and having the property of absorbing visible light of a color except white sufficiently when irradiated with said absorbable light to substantially block transmission thereof and to appear opaque therein, exposing said sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface of said sheet, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface of said sheet, said holes not being visible to the unaided eye, irradiating said absorbable colored light on one side of said sheet making said sheet appear opaque therein, said sheet allowing transmission of said colored light only through said holes therein and said colored light emerging from said holes on the opposite side of said sheet being detectable by the unaided eye.
Claim 3
Dependent Claim
12 words
A process according to claim 1 wherein said material is a plastic.
Claim 4
Dependent Claim
27 words
A process according to claim 2 wherein said plastic is a cellulose ester selected from the group consisting of cellulose nitrate, cellulose acetate and cellulose acetate butyrate.
Claim 5
Dependent Claim
165 words
A process for detecting and measuring radiation damage which comprises providing a sheet of a dielectric material having a thickness ranging from about 1 micron to 20 microns, said material being characterized as water-clear and having the property of blocking transmission of infrared or ultraviolet light, exposing said sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface of said sheet, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface of said sheet, said holes not being visible to the unaided eye, irradiating light selected from the group consisting of infrared light and ultraviolet light on one side of said sheet, said sheet allowing transmission of said light only through said holes therein and providing means in association with the opposite side of said sheet to make said infrared or ultraviolet light emerging from said holes visible.
Claim 6
Dependent Claim
165 words
A process for detecting and measuring radiation damage which comprises providing a sheet of a dielectric material having a thickness ranging from about 1 micron to 20 microns, said material being characterized as water-clear and having the property of blocking transmission of infrared or ultraviolet light, exposing said sheet to radiation to produce tracks of radiation damaged material therein extending from one surface through the opposite surface of said sheet, contacting said sheet with an etchant to selectively dissolve and remove said tracks of damaged material to form holes therein passing from one surface through the opposite surface of said sheet, said holes not being visible to the unaided eye, irradiating light selected from the group consisting of infrared light and ultraviolet light on one side of said sheet, said sheet allowing transmission of said light only through said holes therein and providing means in association with the opposite side of said sheet to make said infrared or ultraviolet light emerging from said holes visible.
Claim 7
Dependent Claim
13 words
A process according to claim 4 wherein said water-clear material is a plastic.
Claim 8
Dependent Claim
27 words
A process according to claim 5 wherein said plastic is a cellulose ester selected from the group consisting of cellulose nitrate, cellulose acetate and cellulose acetate butyrate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |